北方稻田和茭白田二化螟越冬幼虫生物学特性的比较-中国生态农业学报.pdfVIP

2009 5 17 3 Chinese Journal of Eco-Agriculture, May 2009, 17(3): 541−544 DOI: 10. 3724/SP.J.1011.2009.00541 * 韩永强 郝丽霞 侯茂林** ( 100193) 在冬初(11 月中旬)和冬后(3 月上旬)调查了北方稻田和茭白田二化螟越冬幼虫的生物学特性。二化螟 越冬幼虫龄期均在 4 龄以上, 茭白田冬初 6 龄幼虫的比例比稻田高 17.5%；冬后稻田和茭白田高龄幼虫比例均 高于冬初。冬初和冬后稻田二化螟雌雄比分别为 1 ︰ ︰ ︰ ︰ 2.0 和 1 1.7, 茭白田分别为 1 1.4 和 1 1.2。冬初幼虫 历期高于冬后, 同一时期不同寄主田之间无显著差异, 但冬初茭白田幼虫历期比稻田长 14.0%；稻田幼虫体重 和蛹重均显著低于茭白田。冬初采集越冬幼虫的死亡率在 65% 以上, 茭白田幼虫的主要致死因子为真菌, 其致 死率在 90% 以上；稻田幼虫的主要致死因子是寄生蜂和细菌, 其致死率分别在 50%和 25% 以上, 其中二化螟 绒茧蜂和中华钝唇姬蜂是优势寄生蜂。 水稻田 茭白田 二化螟 越冬 生物学特性 : S435.112 : A : 1671-3990(2009)03-0541-04 Comparison of overwintered bionomics of Chilo suppressalis larvae from paddy-rice field with those from water-oat field in North China HAN Yong-Qiang, HAO Li-Xia, HOU Mao-Lin (State Key Laboratory of Plant Disease and Insect Pest Biology, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China) Abstract Bionomics of Chilo suppressalis larvae overwintering in paddy-rice and water-oat fields were investigated in Beijing in th early-winter (middle November) and after-winter (early March). The results show that overwintering larvae are 4 instar or older, and the 6th instar ratio in water-oat fields is 17.5% higher than that in paddy-rice fields in early-winter. Old larvae account for a higher percent in after-winter period than in early-winter. Female to male larvae ratios are respectively 1 2.0 and 1 1.7 in early-wi